package com.twm.boot;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

public class SpringContextHolder implements ApplicationContextAware, DisposableBean {

    private static ApplicationContext applicationContext =null;

    /**
     * 获取applicationContext
     */
    public static ApplicationContext getApplicationContext() {
        if (applicationContext == null) {
            throw new IllegalStateException("applicaitonContext属性未注入, 请在SpringBoot启动类中注册SpringContextHolder.");
        }else {
            return applicationContext;
        }
    }

    /**
     * 通过name获取 Bean
     * @param name 类名称
     * @return 实例对象
     */
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    /**
     * 通过class获取Bean
     */
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    /**
     * 通过name,以及Clazz返回指定的Bean
     */
    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name, clazz);
    }


    @Override
    public void destroy() {
        applicationContext = null;
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextHolder.applicationContext=applicationContext;
    }
}
